Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f93af004af0313…

MALICIOUS

PDF

74.4 KB Created: 2021-03-25 10:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3c4789e5d7d89553571c1a4715ea0b SHA-1: 191b7c03e66659e4bc3f5b3159d39e1bf6e8cb10 SHA-256: 89f93af004af03131cb12e90c441eaa3197b22d813f43de93b14d35565070cf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/123?utm_term=business+information+services+job+description
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/833844b962.pdf
    • http://ag-management.space/poems_written_by_annie_johnson_flintswpcg.pdf
    • http://finansi-7.online/harry_potter_books_set_1-7tpdwz.pdf
    • http://votixowet.22web.org/30665554299.pdf
    • http://lnstagramverifiedsbadgeforms.com/boxepurubotekos2h0w.pdf
    • http://pet-guru.shop/11597731729d0inn.pdf
    • http://stickerrus.ru/mosuzemizedovonojirptlg.pdf
    • http://theboldpantsproject.com/gorillaz_album_zipjen3n.pdf
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/987aa4135a1762.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_ef75d284696a4a45824544b778102d9c.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_cc7a6575ead9434e869971966ddfbeb5.pdf?index=true
    • https://s3.amazonaws.com/tomamujuf/how_to_learn_stock_technical_analysis.pdf
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_be27d2e19fd8404f8ce21dba7948b514.pdf?index=true
    • https://s3.amazonaws.com/tapexiw/vickers_hardness_test_lab_report_politeknik.pdf
    • http://mulotuzasokafo.epizy.com/folk_dj_songs_telugu.pdf
    • https://s3.amazonaws.com/wupixufekijax/gerovasekux.pdf
    • https://s3.amazonaws.com/kezemiradigu/jelix.pdf
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_e7cc02609fa1479291c27da57a7721d0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a1.bin
3ffe8ac3745e9bdc0b4f9c4e00d27643d6cb1b8bda40eaf1605e2776a585f691		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 5592 bytes
font_01_sfnt_off0000f896.bin
c5cd4a245e6c325e0df5c8690c36c130db2719db0a4377a9aea73ddf212f6a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10260 bytes

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